Kunal Nayyar reckons that The Big Bang Theory could be renewed for three more series.

The cast are confirmed for another season for the hit US sitcom, but beyond that it's all up in the air.

"I definitely think we'll do seasons eight and nine, and maybe season 10. Who knows? Maybe we won't do more than 10," said the British-born actor, who plays Indian astrophysicist Raj.

"It's going to end obviously, but I never want this period of my life to end because it's just so much fun. We're a family. We love each other - too much."

The show's success has been as much of a surprise to the cast. Since its launch in 2007 it has become a cult hit, growing into a runaway success, and currently reigns as the number one comedy on American cable networks, both first-run and repeats.

Kunal said: "You can never imagine or predict this. We're living a dream. We're all very humbled and blessed to be doing this. It'll end one day and it will be sad, so right now we're just thankful for every single day."